Pitman for double-acting presses



(No Model.)

-J. M. ELLIS;

PITMAN FOR DOUBLE ACTING PRES-SE8.

Patente Ff Z I I F g. 4 I

' G at Wyn/255 55,

Unite. STATES .IAMES M. ELLIS, OF MILLDALE, CONNECTICUT.

PITMAN FOR DOUBLE-ACTING PRESSES.

SPECIFICATION forming part of. Letters Patent No. 267,408, datedNovember 14,1882.

' Application filed October 2,1882. (No model.)

To all whom it may concern:

Be it known that 1, JAMES M. ELLIS, of Milldale, in the county ofHartford and State of Connecticut, have invented certain new and usefulImprovements in Pitmen for Double- Acting Presses, of which thefollowing is a specification.

My invention relates to improvements in pitinen for double-actingpresses, in which the two pitmen-arms which connect the two outsidecranks with the two sides ot'.the pressslide are adjusted by a singlemechanism, also in which said adjusting mechanism is of a peculiarconstruction; and the objects ofmy invention are to more convenientlyadjust the throw of the main slide, and to so adjust it that the twocranks of the press-shaft shall always bear evenly upon the slide andallow it to work free and easy, and so that the pitman, when adjusted,shall be very firm and rigid. I attain these objects by the mechanismillustrated in the accompanying drawings, in which- Figure 1 is a frontelevation of my double pitman and so much of a double-acting press as isnecessary to show the connection therewith. Fig. 2 is a vertical sectionof the main portion of my pitman on line y y of Fig. 3. Fig. 3 is ahorizontal section of the same on line a: a; of Fig. 1, and Fig. 4 apartial section and elevation of a modified form of the same.

A designates the ordinary shaft of a doubleacting press, having themiddlev crank or eccentric lor the box a for driving the ordinary middleslide, and upon the sides thereof the two cranks or eccentrics for theboxes I) b for driving the main slide B. In Figs. 2 and 4 the arms uponwhich said boxes I) b are formed are represented as broken off; butthese boxes are of any ordinary construction, and the full length ofsaid arms is shown clearly in Fig. 1. Heretofore three pitmen have beenemployed on such pressesthe pitman 0 for the middle and smaller slide,and two pitmen for driving the main slide 13, one upon each side of themiddle pitman, c. These two pitmen, although for driving a single slide,had to be separately adjusted, and it is not only a difficult task toadjust them properly, requiring considerable time, but oftentimes onepitman would be a trifle longer than the other, so as to cause the slideto bind. I overcome these difficulties by connecting the cranks, boxes 0b, and slide B by means of one double pitman having only oneadjustingmechanism, instead of two sepaate pitmen with two separateadjusting mechanisms.

I form the boxes I) b for the outside cranks of the shaft A upon theupper end of the hollow piece C, said piece being left slightly open atthe front, and provided with ears d d and binding-screw e. The lower endof the-pitman is formed of a similar piece, I), with like ears dd andbinding-screw e, and two knuckles, g g, by which to pin it to the twosides of the slide B. The interior of both pieces C and D is threaded tocorrespond with the respective ends of the adjusting-head E, one end ofwhich has a right-hand thread and the other a left-hand thread. Themiddle portion of the head E is provided'with holes to re-. The headjusted at pleasure, and the parts can be held 7 rigidly together bytightening said screws. This will adjust the pitman for both of theboxes I) b and knucklesg g at one and the same time, so that if they areproperly constructed the main slidewill always be true and square, so asnot to bind, and the adjustment can be effected much more rapidly thanit can when two separate pitmen are employed for the two sides of oneslide.

I have herein shown and described the rightand-left-hand threaded headwith a bindingpiece and screw at each end, because I prefer such anadjustment; but other adjusting mechanisms may be employed, so long asthe two cranks and the two sides of the main slide of a double-actingpress are so connected as to be adjusted simultaneously by asingle adjusting mechanism. In Fig. i an adjusting mechanism is shown in which thepiece C is the same as before described and the head E is threaded onlyon one end. The lower end is provided with a flange, h, and is receivedin the piece D, where it is held by a nut, 70, which, for convenience ofassembling the parts, may

be made in two or more pieces. This head is hollow or bored out to allowfree play of the middle pitman.

In both kinds of adjusting mechanisms herein described there is a hollowcylindrical adjusting-head of a size large enough to allow the middlepitman free play, and therefore the hollow and internally-threaded pieceor pieces of the pitman which are left open or slotted at the front mustnecessarily be ona large circle. This enables said piece or pieces toyield readily under the pressure of the binding-screw, and in soyielding to fit snugly the entire circumference of the threaded headless the width of the slot or opening at the front, thereby binding thehead very rigidly in place.

I do not claim a pitman having a right-andleft-hand-threaded head andsockets correspondingly threaded and provided with binding-screws whenthe sockets are slit on two or more sides or when they are provided withcaps; but

I claim as my invention- 1. In a double-acting press, theherein-described double pitman having boxes or bearings for the twooutside cranks of the pressshaft, knuckles or bearings for the two sidesof the slide, and a single mechanism for adjusting both sides of saidpitman, substantially as described, and for the purpose specified.

2. In a pitman for presses, the combination of the threaded head and thehollow and the internally-threaded end piece which receives the threadedportion of said head, slit open at the front side only, and providedwith the forwardly-projecting lugs and binding-screw, substantially asdescribed, and for the pur' pose specified.

JAMES M. ELLIS.

*itnesses WALTER HoLooMB, FRANK. M. ELLIs.

